I’m pretty sure this is the first movie whose primary 3-D motif is people blowing pot smoke at the camera. After the disappointing Harold & Kumar Escape From Guantanamo Bay, screenwriters Jon Hurwitz and Hayden Schlossberg bounce back with this third installment of their stoner-comedy franchise. This time the quest narrative involves Asian-American pals Harold (John Cho) and Kumar (Kal Penn) chasing after a Christmas tree to replace one they accidentally burned down, but that’s only an excuse for the relentless barrage of tasteless gags, most of them damned funny. Among the highlights are an adorable toddler developing a taste for cocaine, Santa Claus getting shot in the face, raucous parodies of A Christmas Story and the Rankin-Bass holiday TV specials, and the usual hedonistic interlude with Neil Patrick Harris. Todd Strauss-Schulson directed; with Danny Trejo and Thomas Lennon.